Flat bands and unconventional superconductivity in a simple model of metal-organic frameworks
M. F. Ohlrich, E. M. Makaresz, H. L. Nourse, B. J. Powell
DOI 10.1103/PhysRevB.111.L100503 · Physical Review B
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Abstract
We show that interference-induced flat bands (IFBs) are commonplace in reticular materials. For example, several metal-organic frameworks, including the superconductor Cu-BHT, form kagome lattices with metals at the vertices and ligands along the bonds. Similar bipartite motifs are common in reticular materials. A tight-binding model on this lattice yields partially occupied IFBs at half filling with large gaps between them and all other bands. Long-range hopping induces curvature in the bands but leaves them flatter and more isolated than those in twisted bilayer graphene. The slave boson theory of the t−J model on this lattice shows unconventional superconductivity. Thus, crystal engineering of reticular materials provides a lattice-driven route to flat bands with high electronic densities, which promote exotic, strongly correlated phenomena.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Cu-BHT Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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